Fatal error: Uncaught Error: Call to a member function query() on null in /var/www/html/php/busca_ids/busqueda_ultimos_id_concepto4.php:8 Stack trace: #0 /var/www/html/php/busca_ids/busqueda_ultimos_id_concepto4.php(11): consulta_maximo_diario_c4() #1 {main} thrown in /var/www/html/php/busca_ids/busqueda_ultimos_id_concepto4.php on line 8